Roller-bearing eccentric



Patented Mar. 16,1920.

314 uantoz Cll'lozncxp l wilma UMa-ED STAfi-QS OFFICE- ERNEST K. THoivrAs'oN, or EAST POINT, GEORGIA, ASsIGNOR To ATLANTA UTILITYl WORKS, OPE'AsT POINT, GEORGIA, A CORPORATION or GEORGIA.

' 't v ROLLER-BEARING ECCENTRIC. i

To all whom t mag/concern.' j i Be itknown that I, ERNEST K. THOMASON,

a citizen of the United States, residing at.

East Point, Fulton county, State of Georgia, have invented certain new'and useful I mprovements in Roller-Bearing Eccentrics,

i of which the following is a specification.

The present invention relates to roller bearing eccentrics.

The Objects of the invention are to provide an'eccentric of this type in which the roller bearing is of relatively small diameter and the parts may be manufactured and assembled easily. Other features and objects of novelty will be apparent from the description taken in connection with the drawings in which:

Figure 1 is a sectional elevation through an eccentric constructed in accordance with the present invention; and

Fig. 2 is a side elevation of the eccentric, the shaft onvwhich it is mounted being shown in section.

Referring to the drawings the eccentric as shown comprises an eccentric block B mounted on a shaft S, a strap assembly A, and a roller bearing R interposed between these parts.

According to this invention the block coinprises two circular elements 10 formed with alined bores 11 to receive the shaft S, these i elements and the shaft being formed with cooperating keyways to receive the `key 12, whereby the elements are -secured to the shaft for rotation therewith. The peripheral surfaces of the elements at their adjacent endsare cylindrical as indicated at 13 and eccentric to the axis of the bores 11. The adjacent ends of the elements 11 are rabbeted so that when they are assembled on the shaft to form the block B an annular groove 14 is formed which is adapted to receive theinner race ring 15 of the roller bearing R. The width of this race ring 15 is slightly greater than the 'width of the groove 14 when the two elements 11 have their ends in contact. They are therefore slightly separated in order to accommodate the said race ring 15. For the purpose of securing the ring against displacement it is clamped between the two elements 10 by bolts 16 eX- tending lengthwise through the elements. The heads 17 and nuts 18 of these bolts are disposed within a recess 19 formed in the Outside ends of the elements 10. These headsy speciiicaiion of Leitersratent. Patented-Mar. 16, 1920.v Application inea April 15, 1919. serial Nb. 290,253. y i

and nuts are, therefore, more or less hidden and do n ot project outside of the outlines of the eccentric block to become a menace. The annular groove 14 is concentric with the cylindrical surfaces 13 and is therefore eccentric to the aXis of the shaft. y i

In order to securely hold Vthe key 12 in place each of the elements .10 hasa set'screw 20 which engages the top ofthe key. In order that these set screws may not be features of danger each of the elements 10 has a radial flange 21 substantially at its outer end, the periphery of which is of substan tially the same radius as the distance from the head of the Set screw 20 to the axis of the shaft. Consequently the heads of the Set screws do not project radially farther away from the axis of the shaft than the flanges 21 and the flanges thus act to prevent objects from Icatching on the revolving set screws.

The strap assembly A, as shown, comprises a main ring 22 which has an integral radial inwardly extending flange 23, the inner periphery of which is adjacent the cylindrical surface 13 of the block B. A cap or cover plate 24 is disposed at the end of the ring 22 opposite the flange 23 and is formed with a rabbeted seat 25 for the'said end of the ring 22. The cap 24 also has an inwardly extending flcnge 26, the inner periphery of which is disposed adjacent the cylindrical surface 13 on the block B. In this manner an annular channel or groovev 27 is formed onthe interior of the ring 22, one side of this groove being formed by the shoulder 28` on the ring and the otherv side being formed by the end surface 29 of thecap. An outer race ring 30 is disposed in this groove 27 and preferably the width of the groove is slightly greater than the width of the race ring so-that the race ring may adjust itself longitudinally. of the strap. vSuitable rollers 31 are interposed between the two race'rings. The main ring and cap of the strap assembly are held together by the bolts 32 eXtending lengthwise through these two parts. The l main ring 22 is provided with a boss 33 formed with the threaded bore 34 to receive the threaded end of the eccentric rod 35.

v and 26 may beV formed with the grooves l1 and 42 respectively to receive packing and' suitable manner. As shown a lubricant cup 38 hasl its nipple 39screwed into the main ring 22, of the strap and the nipple corn municates with the passage formed in the ring and leading to the roller bearing.

The inner peripheries of the anges 23 prevent lubricant working'outside the strap. The eccentricrbloclr B may be manufac- .tured from a single casting in which the groove le is machinedr of slightly less width than the inner race ring of the roller bearing. Then the casting may bei divided into two parts to provide theV elements 10; or the block may be made from two elements 10.

In assembling 4the parts ofthe eccentric the roller bearing is positioned in the main ring 22 of the strap and then'held in place by attaching the cap 24. The assembled strap Vwith the bearing is then slipped over one of theelements 10 and thereafter the other ele'- ment 10 is pushed into position and the two elements secured together by the bolts 16.

It is to be understood thatthe invention is not limited to the exact details shown but includes modifications and changes which come within the scope of theY appended claims.

Having thus described the invention what y vis claimed as new and desired to be secured by Letters Patent is Y l. A roller bearing eccentric comprising in combinatioma circular block having a bore to receive a/shaft and formed with a peripheral annular groove eccentric to the axis of said bore, an eccentric strap surrounding saidbvlock and provided with an interior annular groove, a roller bearing disposed between said block Vand strap comprising an inner race ring disposed in the groove in the block, an outer race ring disposed in the groove in the strap and coperating rollers, one of said race rings being secured in its groove and the other having a slight longitudinal play therein.

A roller bearing eccentricl comprising in combination, a block consisting of two circular elements formed with alined bores to receive Y a shaft, an inner race ring clampedbetween said elements with its axis eccentric to the axis of the bore, a strap surrounding said inner race ring in spaced relation, an outer racey ring carried by said lstrap for slight relative longitudinal -inovement, and rollers interposedbetween said race rings. f

3. A roller 'bearing eccentric comprising in combination a block formed with a bore to receive VVa shaft, an inner race ringl carried bysaid block eccentric to the axis of said bore, a strap comprising a ring having an interior cylindrical surface and a cover, said cylindrical surface having a shoulder spaced axially Yfrom the edge of the cover thereby forming a groove, an outer race ring seated in the groove in said strap, the width of the groove being slightly greater than the width of the ring whereby saidV outer'ring may have a slight longitudinal play, and rollers disposedy between said race rings;

4. A roller bearing eccentric comprising s in combination, a block consisting vof twocirculan elements having alined bores, an inner race ring disposed between said ele ments with its axis eccentric to the bore axis, bolts extending lengthwise through the eleinents to clamp said ring, ther outside ends of said elements being recessed for the heads and nuts of the bolts, a strap comprising a main ring and acover ring, an outer race ring disposed in an annular groove formed by said strap rings, bolts extending-lengthwise` through said strap rings, said elements concentrically Vwith said surfaces, str-ap comprising-a mainY ring' and a cap eachhaving a radial inwardly projecting flan-ge the inner periphery of which is disposed close to the cylindrical surface of one of `said elements, an outer race ring carried by said strap' and'rollers associated with said race rings. l v

In testimony whereof l affix my signature.

ERNESTK. THOMASONL 

